1 /* Main program of GNU linker.
2 Copyright (C) 1991-2016 Free Software Foundation, Inc.
3 Written by Steve Chamberlain steve@cygnus.com
5 This file is part of the GNU Binutils.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
24 #include "safe-ctype.h"
25 #include "libiberty.h"
28 #include "filenames.h"
43 #include "plugin-api.h"
44 #endif /* ENABLE_PLUGINS */
46 /* Somewhere above, sys/stat.h got included. */
47 #if !defined(S_ISDIR) && defined(S_IFDIR)
48 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
59 #ifndef TARGET_SYSTEM_ROOT
60 #define TARGET_SYSTEM_ROOT ""
65 FILE *saved_script_handle = NULL;
66 FILE *previous_script_handle = NULL;
67 bfd_boolean force_make_executable = FALSE;
70 const char *output_filename = "a.out";
72 /* Name this program was invoked by. */
75 /* The prefix for system library directories. */
76 const char *ld_sysroot;
78 /* The canonical representation of ld_sysroot. */
79 char * ld_canon_sysroot;
80 int ld_canon_sysroot_len;
82 /* Set by -G argument, for targets like MIPS ELF. */
83 int g_switch_value = 8;
85 /* Nonzero means print names of input files as processed. */
86 bfd_boolean trace_files;
88 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
91 /* Nonzero means version number was printed, so exit successfully
92 instead of complaining if no input files are given. */
93 bfd_boolean version_printed;
95 /* TRUE if we should demangle symbol names. */
96 bfd_boolean demangling;
98 args_type command_line;
100 ld_config_type config;
102 sort_type sort_section;
104 static const char *get_sysroot
106 static char *get_emulation
108 static bfd_boolean add_archive_element
109 (struct bfd_link_info *, bfd *, const char *, bfd **);
110 static bfd_boolean multiple_definition
111 (struct bfd_link_info *, struct bfd_link_hash_entry *,
112 bfd *, asection *, bfd_vma);
113 static bfd_boolean multiple_common
114 (struct bfd_link_info *, struct bfd_link_hash_entry *,
115 bfd *, enum bfd_link_hash_type, bfd_vma);
116 static bfd_boolean add_to_set
117 (struct bfd_link_info *, struct bfd_link_hash_entry *,
118 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
119 static bfd_boolean constructor_callback
120 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
121 asection *, bfd_vma);
122 static bfd_boolean warning_callback
123 (struct bfd_link_info *, const char *, const char *, bfd *,
124 asection *, bfd_vma);
125 static void warning_find_reloc
126 (bfd *, asection *, void *);
127 static bfd_boolean undefined_symbol
128 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
130 static bfd_boolean reloc_overflow
131 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
132 const char *, bfd_vma, bfd *, asection *, bfd_vma);
133 static bfd_boolean reloc_dangerous
134 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
135 static bfd_boolean unattached_reloc
136 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
137 static bfd_boolean notice
138 (struct bfd_link_info *, struct bfd_link_hash_entry *,
139 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
141 static struct bfd_link_callbacks link_callbacks =
147 constructor_callback,
157 ldlang_override_segment_assignment
160 static bfd_assert_handler_type default_bfd_assert_handler;
162 struct bfd_link_info link_info;
167 bfd_cache_close_all ();
168 #ifdef ENABLE_PLUGINS
169 plugin_call_cleanup ();
171 if (output_filename && delete_output_file_on_failure)
172 unlink_if_ordinary (output_filename);
175 /* If there's a BFD assertion, we'll notice and exit with an error
176 unless otherwise instructed. */
179 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
180 const char *file, int line)
182 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
183 config.make_executable = FALSE;
187 main (int argc, char **argv)
190 long start_time = get_run_time ();
192 char *start_sbrk = (char *) sbrk (0);
195 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
196 setlocale (LC_MESSAGES, "");
198 #if defined (HAVE_SETLOCALE)
199 setlocale (LC_CTYPE, "");
201 bindtextdomain (PACKAGE, LOCALEDIR);
202 textdomain (PACKAGE);
204 program_name = argv[0];
205 xmalloc_set_program_name (program_name);
207 START_PROGRESS (program_name, 0);
209 expandargv (&argc, &argv);
213 bfd_set_error_program_name (program_name);
215 /* We want to notice and fail on those nasty BFD assertions which are
216 likely to signal incorrect output being generated but otherwise may
218 default_bfd_assert_handler = bfd_set_assert_handler (ld_bfd_assert_handler);
220 xatexit (ld_cleanup);
222 /* Set up the sysroot directory. */
223 ld_sysroot = get_sysroot (argc, argv);
225 ld_canon_sysroot = lrealpath (ld_sysroot);
226 if (ld_canon_sysroot)
227 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
229 ld_canon_sysroot_len = -1;
231 /* Set the default BFD target based on the configured target. Doing
232 this permits the linker to be configured for a particular target,
233 and linked against a shared BFD library which was configured for
234 a different target. The macro TARGET is defined by Makefile. */
235 if (! bfd_set_default_target (TARGET))
237 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
248 config.build_constructors = TRUE;
249 config.rpath_separator = ':';
250 config.split_by_reloc = (unsigned) -1;
251 config.split_by_file = (bfd_size_type) -1;
252 config.make_executable = TRUE;
253 config.magic_demand_paged = TRUE;
254 config.text_read_only = TRUE;
255 link_info.disable_target_specific_optimizations = -1;
257 command_line.warn_mismatch = TRUE;
258 command_line.warn_search_mismatch = TRUE;
259 command_line.check_section_addresses = -1;
261 /* We initialize DEMANGLING based on the environment variable
262 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
263 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
264 environment. Acting the same way here lets us provide the same
265 interface by default. */
266 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
268 link_info.allow_undefined_version = TRUE;
269 link_info.keep_memory = TRUE;
270 link_info.combreloc = TRUE;
271 link_info.strip_discarded = TRUE;
272 link_info.emit_hash = TRUE;
273 link_info.callbacks = &link_callbacks;
274 link_info.input_bfds_tail = &link_info.input_bfds;
275 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
276 and _fini symbols. We are compatible. */
277 link_info.init_function = "_init";
278 link_info.fini_function = "_fini";
279 link_info.relax_pass = 1;
280 link_info.extern_protected_data = -1;
281 link_info.dynamic_undefined_weak = -1;
282 link_info.pei386_auto_import = -1;
283 link_info.spare_dynamic_tags = 5;
284 link_info.path_separator = ':';
285 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
286 link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
289 ldfile_add_arch ("");
290 emulation = get_emulation (argc, argv);
291 ldemul_choose_mode (emulation);
292 default_target = ldemul_choose_target (argc, argv);
293 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
294 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
297 ldemul_before_parse ();
298 lang_has_input_file = FALSE;
299 parse_args (argc, argv);
301 if (config.hash_table_size != 0)
302 bfd_hash_set_default_size (config.hash_table_size);
304 #ifdef ENABLE_PLUGINS
305 /* Now all the plugin arguments have been gathered, we can load them. */
306 plugin_load_plugins ();
307 #endif /* ENABLE_PLUGINS */
309 ldemul_set_symbols ();
311 /* If we have not already opened and parsed a linker script,
312 try the default script from command line first. */
313 if (saved_script_handle == NULL
314 && command_line.default_script != NULL)
316 ldfile_open_command_file (command_line.default_script);
317 parser_input = input_script;
321 /* If we have not already opened and parsed a linker script
322 read the emulation's appropriate default script. */
323 if (saved_script_handle == NULL)
326 char *s = ldemul_get_script (&isfile);
329 ldfile_open_default_command_file (s);
333 lex_redirect (s, _("built in linker script"), 1);
335 parser_input = input_script;
342 if (saved_script_handle)
343 info_msg (_("using external linker script:"));
345 info_msg (_("using internal linker script:"));
346 info_msg ("\n==================================================\n");
348 if (saved_script_handle)
350 static const int ld_bufsz = 8193;
352 char *buf = (char *) xmalloc (ld_bufsz);
354 rewind (saved_script_handle);
355 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
360 rewind (saved_script_handle);
367 info_msg (ldemul_get_script (&isfile));
370 info_msg ("\n==================================================\n");
373 if (command_line.print_output_format)
374 info_msg ("%s\n", lang_get_output_target ());
378 /* If the only command line argument has been -v or --version or --verbose
379 then ignore any input files provided by linker scripts and exit now.
380 We do not want to create an output file when the linker is just invoked
381 to provide version information. */
382 if (argc == 2 && version_printed)
385 if (!lang_has_input_file)
387 if (version_printed || command_line.print_output_format)
389 einfo (_("%P%F: no input files\n"));
393 info_msg (_("%P: mode %s\n"), emulation);
395 ldemul_after_parse ();
397 if (config.map_filename)
399 if (strcmp (config.map_filename, "-") == 0)
401 config.map_file = stdout;
405 config.map_file = fopen (config.map_filename, FOPEN_WT);
406 if (config.map_file == (FILE *) NULL)
408 bfd_set_error (bfd_error_system_call);
409 einfo (_("%P%F: cannot open map file %s: %E\n"),
410 config.map_filename);
417 /* Print error messages for any missing symbols, for any warning
418 symbols, and possibly multiple definitions. */
419 if (bfd_link_relocatable (&link_info))
420 link_info.output_bfd->flags &= ~EXEC_P;
422 link_info.output_bfd->flags |= EXEC_P;
424 if ((link_info.compress_debug & COMPRESS_DEBUG))
426 link_info.output_bfd->flags |= BFD_COMPRESS;
427 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
428 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
433 if (config.map_file != NULL)
435 if (command_line.cref)
436 output_cref (config.map_file != NULL ? config.map_file : stdout);
437 if (nocrossref_list != NULL)
438 check_nocrossrefs ();
439 if (command_line.print_memory_usage)
440 lang_print_memory_usage ();
443 struct bfd_link_hash_entry * h;
445 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
446 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
452 /* Even if we're producing relocatable output, some non-fatal errors should
453 be reported in the exit status. (What non-fatal errors, if any, do we
454 want to ignore for relocatable output?) */
455 if (!config.make_executable && !force_make_executable)
458 einfo (_("%P: link errors found, deleting executable `%s'\n"),
461 /* The file will be removed by ld_cleanup. */
466 if (! bfd_close (link_info.output_bfd))
467 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
469 /* If the --force-exe-suffix is enabled, and we're making an
470 executable file and it doesn't end in .exe, copy it to one
472 if (!bfd_link_relocatable (&link_info)
473 && command_line.force_exe_suffix)
475 int len = strlen (output_filename);
478 || (strcasecmp (output_filename + len - 4, ".exe") != 0
479 && strcasecmp (output_filename + len - 4, ".dll") != 0))
483 const int bsize = 4096;
484 char *buf = (char *) xmalloc (bsize);
486 char *dst_name = (char *) xmalloc (len + 5);
488 strcpy (dst_name, output_filename);
489 strcat (dst_name, ".exe");
490 src = fopen (output_filename, FOPEN_RB);
491 dst = fopen (dst_name, FOPEN_WB);
494 einfo (_("%P%F: unable to open for source of copy `%s'\n"),
497 einfo (_("%P%F: unable to open for destination of copy `%s'\n"),
499 while ((l = fread (buf, 1, bsize, src)) > 0)
501 int done = fwrite (buf, 1, l, dst);
504 einfo (_("%P: Error writing file `%s'\n"), dst_name);
508 if (fclose (dst) == EOF)
509 einfo (_("%P: Error closing file `%s'\n"), dst_name);
516 END_PROGRESS (program_name);
521 char *lim = (char *) sbrk (0);
523 long run_time = get_run_time () - start_time;
526 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
527 program_name, run_time / 1000000, run_time % 1000000);
529 fprintf (stderr, _("%s: data size %ld\n"), program_name,
530 (long) (lim - start_sbrk));
535 /* Prevent ld_cleanup from doing anything, after a successful link. */
536 output_filename = NULL;
542 /* If the configured sysroot is relocatable, try relocating it based on
543 default prefix FROM. Return the relocated directory if it exists,
544 otherwise return null. */
547 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
549 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
553 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
556 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
564 /* Return the sysroot directory. Return "" if no sysroot is being used. */
567 get_sysroot (int argc, char **argv)
572 for (i = 1; i < argc; i++)
573 if (CONST_STRNEQ (argv[i], "--sysroot="))
574 return argv[i] + strlen ("--sysroot=");
576 path = get_relative_sysroot (BINDIR);
580 path = get_relative_sysroot (TOOLBINDIR);
584 return TARGET_SYSTEM_ROOT;
587 /* We need to find any explicitly given emulation in order to initialize the
588 state that's needed by the lex&yacc argument parser (parse_args). */
591 get_emulation (int argc, char **argv)
596 emulation = getenv (EMULATION_ENVIRON);
597 if (emulation == NULL)
598 emulation = DEFAULT_EMULATION;
600 for (i = 1; i < argc; i++)
602 if (CONST_STRNEQ (argv[i], "-m"))
604 if (argv[i][2] == '\0')
609 emulation = argv[i + 1];
613 einfo (_("%P%F: missing argument to -m\n"));
615 else if (strcmp (argv[i], "-mips1") == 0
616 || strcmp (argv[i], "-mips2") == 0
617 || strcmp (argv[i], "-mips3") == 0
618 || strcmp (argv[i], "-mips4") == 0
619 || strcmp (argv[i], "-mips5") == 0
620 || strcmp (argv[i], "-mips32") == 0
621 || strcmp (argv[i], "-mips32r2") == 0
622 || strcmp (argv[i], "-mips32r6") == 0
623 || strcmp (argv[i], "-mips64") == 0
624 || strcmp (argv[i], "-mips64r2") == 0
625 || strcmp (argv[i], "-mips64r6") == 0)
627 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
628 passed to the linker by some MIPS compilers. They
629 generally tell the linker to use a slightly different
630 library path. Perhaps someday these should be
631 implemented as emulations; until then, we just ignore
632 the arguments and hope that nobody ever creates
633 emulations named ips1, ips2 or ips3. */
635 else if (strcmp (argv[i], "-m486") == 0)
637 /* FIXME: The argument -m486 is passed to the linker on
638 some Linux systems. Hope that nobody creates an
639 emulation named 486. */
644 emulation = &argv[i][2];
653 add_ysym (const char *name)
655 if (link_info.notice_hash == NULL)
657 link_info.notice_hash =
658 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
659 if (!bfd_hash_table_init_n (link_info.notice_hash,
661 sizeof (struct bfd_hash_entry),
663 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
666 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
667 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
671 add_ignoresym (struct bfd_link_info *info, const char *name)
673 if (info->ignore_hash == NULL)
675 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
676 if (! bfd_hash_table_init_n (info->ignore_hash,
678 sizeof (struct bfd_hash_entry),
680 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
683 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
684 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
687 /* Record a symbol to be wrapped, from the --wrap option. */
690 add_wrap (const char *name)
692 if (link_info.wrap_hash == NULL)
694 link_info.wrap_hash =
695 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
696 if (!bfd_hash_table_init_n (link_info.wrap_hash,
698 sizeof (struct bfd_hash_entry),
700 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
703 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
704 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
707 /* Handle the -retain-symbols-file option. */
710 add_keepsyms_file (const char *filename)
717 if (link_info.strip == strip_some)
718 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
720 file = fopen (filename, "r");
723 bfd_set_error (bfd_error_system_call);
724 einfo ("%X%P: %s: %E\n", filename);
728 link_info.keep_hash = (struct bfd_hash_table *)
729 xmalloc (sizeof (struct bfd_hash_table));
730 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
731 sizeof (struct bfd_hash_entry)))
732 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
735 buf = (char *) xmalloc (bufsize);
747 while (! ISSPACE (c) && c != EOF)
754 buf = (char *) xrealloc (buf, bufsize);
761 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
762 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
766 if (link_info.strip != strip_none)
767 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
770 link_info.strip = strip_some;
774 /* Callbacks from the BFD linker routines. */
776 /* This is called when BFD has decided to include an archive member in
780 add_archive_element (struct bfd_link_info *info,
783 bfd **subsbfd ATTRIBUTE_UNUSED)
785 lang_input_statement_type *input;
786 lang_input_statement_type orig_input;
788 input = (lang_input_statement_type *)
789 xcalloc (1, sizeof (lang_input_statement_type));
790 input->filename = abfd->filename;
791 input->local_sym_name = abfd->filename;
792 input->the_bfd = abfd;
794 /* Save the original data for trace files/tries below, as plugins
795 (if enabled) may possibly alter it to point to a replacement
796 BFD, but we still want to output the original BFD filename. */
798 #ifdef ENABLE_PLUGINS
799 if (link_info.lto_plugin_active && !no_more_claiming)
801 /* We must offer this archive member to the plugins to claim. */
802 plugin_maybe_claim (input);
803 if (input->flags.claimed)
805 input->flags.claim_archive = TRUE;
806 *subsbfd = input->the_bfd;
809 #endif /* ENABLE_PLUGINS */
811 ldlang_add_file (input);
813 if (config.map_file != NULL)
815 static bfd_boolean header_printed;
816 struct bfd_link_hash_entry *h;
820 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
832 case bfd_link_hash_defined:
833 case bfd_link_hash_defweak:
834 from = h->u.def.section->owner;
837 case bfd_link_hash_undefined:
838 case bfd_link_hash_undefweak:
839 from = h->u.undef.abfd;
842 case bfd_link_hash_common:
843 from = h->u.c.p->section->owner;
848 if (! header_printed)
852 sprintf (buf, _("Archive member included "
853 "to satisfy reference by file (symbol)\n\n"));
855 header_printed = TRUE;
858 if (bfd_my_archive (abfd) == NULL)
860 minfo ("%s", bfd_get_filename (abfd));
861 len = strlen (bfd_get_filename (abfd));
865 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
866 bfd_get_filename (abfd));
867 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
868 + strlen (bfd_get_filename (abfd))
886 minfo ("(%T)\n", h->root.string);
888 minfo ("(%s)\n", name);
891 if (trace_files || verbose)
892 info_msg ("%I\n", &orig_input);
896 /* This is called when BFD has discovered a symbol which is defined
900 multiple_definition (struct bfd_link_info *info,
901 struct bfd_link_hash_entry *h,
911 if (info->allow_multiple_definition)
916 case bfd_link_hash_defined:
917 osec = h->u.def.section;
918 oval = h->u.def.value;
919 obfd = h->u.def.section->owner;
921 case bfd_link_hash_indirect:
922 osec = bfd_ind_section_ptr;
930 /* Ignore a redefinition of an absolute symbol to the
931 same value; it's harmless. */
932 if (h->type == bfd_link_hash_defined
933 && bfd_is_abs_section (osec)
934 && bfd_is_abs_section (nsec)
938 /* If either section has the output_section field set to
939 bfd_abs_section_ptr, it means that the section is being
940 discarded, and this is not really a multiple definition at all.
941 FIXME: It would be cleaner to somehow ignore symbols defined in
942 sections which are being discarded. */
943 if ((osec->output_section != NULL
944 && ! bfd_is_abs_section (osec)
945 && bfd_is_abs_section (osec->output_section))
946 || (nsec->output_section != NULL
947 && ! bfd_is_abs_section (nsec)
948 && bfd_is_abs_section (nsec->output_section)))
951 name = h->root.string;
959 einfo (_("%X%C: multiple definition of `%T'\n"),
960 nbfd, nsec, nval, name);
962 einfo (_("%D: first defined here\n"), obfd, osec, oval);
964 if (RELAXATION_ENABLED_BY_USER)
966 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
973 /* This is called when there is a definition of a common symbol, or
974 when a common symbol is found for a symbol that is already defined,
975 or when two common symbols are found. We only do something if
976 -warn-common was used. */
979 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
980 struct bfd_link_hash_entry *h,
982 enum bfd_link_hash_type ntype,
987 enum bfd_link_hash_type otype;
990 if (!config.warn_common)
993 name = h->root.string;
995 if (otype == bfd_link_hash_common)
997 obfd = h->u.c.p->section->owner;
1000 else if (otype == bfd_link_hash_defined
1001 || otype == bfd_link_hash_defweak)
1003 obfd = h->u.def.section->owner;
1008 /* FIXME: It would nice if we could report the BFD which defined
1009 an indirect symbol, but we don't have anywhere to store the
1015 if (ntype == bfd_link_hash_defined
1016 || ntype == bfd_link_hash_defweak
1017 || ntype == bfd_link_hash_indirect)
1019 ASSERT (otype == bfd_link_hash_common);
1020 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1023 einfo (_("%B: warning: common is here\n"), obfd);
1025 else if (otype == bfd_link_hash_defined
1026 || otype == bfd_link_hash_defweak
1027 || otype == bfd_link_hash_indirect)
1029 ASSERT (ntype == bfd_link_hash_common);
1030 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1033 einfo (_("%B: warning: defined here\n"), obfd);
1037 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1040 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1043 einfo (_("%B: warning: larger common is here\n"), obfd);
1045 else if (nsize > osize)
1047 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1050 einfo (_("%B: warning: smaller common is here\n"), obfd);
1054 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1056 einfo (_("%B: warning: previous common is here\n"), obfd);
1063 /* This is called when BFD has discovered a set element. H is the
1064 entry in the linker hash table for the set. SECTION and VALUE
1065 represent a value which should be added to the set. */
1068 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1069 struct bfd_link_hash_entry *h,
1070 bfd_reloc_code_real_type reloc,
1075 if (config.warn_constructors)
1076 einfo (_("%P: warning: global constructor %s used\n"),
1079 if (! config.build_constructors)
1082 ldctor_add_set_entry (h, reloc, NULL, section, value);
1084 if (h->type == bfd_link_hash_new)
1086 h->type = bfd_link_hash_undefined;
1087 h->u.undef.abfd = abfd;
1088 /* We don't call bfd_link_add_undef to add this to the list of
1089 undefined symbols because we are going to define it
1096 /* This is called when BFD has discovered a constructor. This is only
1097 called for some object file formats--those which do not handle
1098 constructors in some more clever fashion. This is similar to
1099 adding an element to a set, but less general. */
1102 constructor_callback (struct bfd_link_info *info,
1103 bfd_boolean constructor,
1110 struct bfd_link_hash_entry *h;
1111 char set_name[1 + sizeof "__CTOR_LIST__"];
1113 if (config.warn_constructors)
1114 einfo (_("%P: warning: global constructor %s used\n"), name);
1116 if (! config.build_constructors)
1119 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1120 useful error message. */
1121 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1122 && (bfd_link_relocatable (info)
1123 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1124 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1127 if (bfd_get_symbol_leading_char (abfd) != '\0')
1128 *s++ = bfd_get_symbol_leading_char (abfd);
1130 strcpy (s, "__CTOR_LIST__");
1132 strcpy (s, "__DTOR_LIST__");
1134 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1135 if (h == (struct bfd_link_hash_entry *) NULL)
1136 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1137 if (h->type == bfd_link_hash_new)
1139 h->type = bfd_link_hash_undefined;
1140 h->u.undef.abfd = abfd;
1141 /* We don't call bfd_link_add_undef to add this to the list of
1142 undefined symbols because we are going to define it
1146 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1150 /* A structure used by warning_callback to pass information through
1151 bfd_map_over_sections. */
1153 struct warning_callback_info
1156 const char *warning;
1161 /* Look through the relocs to see if we can find a plausible address
1162 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1165 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1167 struct warning_callback_info cinfo;
1169 if (!bfd_generic_link_read_symbols (abfd))
1170 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1172 cinfo.found = FALSE;
1173 cinfo.warning = warning;
1174 cinfo.symbol = symbol;
1175 cinfo.asymbols = bfd_get_outsymbols (abfd);
1176 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1180 /* This is called when there is a reference to a warning symbol. */
1183 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1184 const char *warning,
1190 /* This is a hack to support warn_multiple_gp. FIXME: This should
1191 have a cleaner interface, but what? */
1192 if (! config.warn_multiple_gp
1193 && strcmp (warning, "using multiple gp values") == 0)
1196 if (section != NULL)
1197 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1198 else if (abfd == NULL)
1199 einfo ("%P: %s%s\n", _("warning: "), warning);
1200 else if (symbol == NULL)
1201 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1202 else if (! symbol_warning (warning, symbol, abfd))
1205 /* Search all input files for a reference to SYMBOL. */
1206 for (b = info->input_bfds; b; b = b->link.next)
1207 if (b != abfd && symbol_warning (warning, symbol, b))
1209 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1215 /* This is called by warning_callback for each section. It checks the
1216 relocs of the section to see if it can find a reference to the
1217 symbol which triggered the warning. If it can, it uses the reloc
1218 to give an error message with a file and line number. */
1221 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1223 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1227 arelent **p, **pend;
1232 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1234 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1238 relpp = (arelent **) xmalloc (relsize);
1239 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1241 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1244 pend = p + relcount;
1245 for (; p < pend && *p != NULL; p++)
1249 if (q->sym_ptr_ptr != NULL
1250 && *q->sym_ptr_ptr != NULL
1251 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1253 /* We found a reloc for the symbol we are looking for. */
1254 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1264 /* This is called when an undefined symbol is found. */
1267 undefined_symbol (struct bfd_link_info *info,
1274 static char *error_name;
1275 static unsigned int error_count;
1277 #define MAX_ERRORS_IN_A_ROW 5
1279 if (info->ignore_hash != NULL
1280 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1283 if (config.warn_once)
1285 /* Only warn once about a particular undefined symbol. */
1286 add_ignoresym (info, name);
1289 /* We never print more than a reasonable number of errors in a row
1290 for a single symbol. */
1291 if (error_name != NULL
1292 && strcmp (name, error_name) == 0)
1297 if (error_name != NULL)
1299 error_name = xstrdup (name);
1302 if (section != NULL)
1304 if (error_count < MAX_ERRORS_IN_A_ROW)
1307 einfo (_("%X%C: undefined reference to `%T'\n"),
1308 abfd, section, address, name);
1310 einfo (_("%C: warning: undefined reference to `%T'\n"),
1311 abfd, section, address, name);
1313 else if (error_count == MAX_ERRORS_IN_A_ROW)
1316 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1317 abfd, section, address, name);
1319 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1320 abfd, section, address, name);
1327 if (error_count < MAX_ERRORS_IN_A_ROW)
1330 einfo (_("%X%B: undefined reference to `%T'\n"),
1333 einfo (_("%B: warning: undefined reference to `%T'\n"),
1336 else if (error_count == MAX_ERRORS_IN_A_ROW)
1339 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1342 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1352 /* Counter to limit the number of relocation overflow error messages
1353 to print. Errors are printed as it is decremented. When it's
1354 called and the counter is zero, a final message is printed
1355 indicating more relocations were omitted. When it gets to -1, no
1356 such errors are printed. If it's initially set to a value less
1357 than -1, all such errors will be printed (--verbose does this). */
1359 int overflow_cutoff_limit = 10;
1361 /* This is called when a reloc overflows. */
1364 reloc_overflow (struct bfd_link_info *info,
1365 struct bfd_link_hash_entry *entry,
1367 const char *reloc_name,
1373 if (overflow_cutoff_limit == -1)
1376 einfo ("%X%H:", abfd, section, address);
1378 if (overflow_cutoff_limit >= 0
1379 && overflow_cutoff_limit-- == 0)
1381 einfo (_(" additional relocation overflows omitted from the output\n"));
1387 while (entry->type == bfd_link_hash_indirect
1388 || entry->type == bfd_link_hash_warning)
1389 entry = entry->u.i.link;
1390 switch (entry->type)
1392 case bfd_link_hash_undefined:
1393 case bfd_link_hash_undefweak:
1394 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1395 reloc_name, entry->root.string);
1397 case bfd_link_hash_defined:
1398 case bfd_link_hash_defweak:
1399 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1400 reloc_name, entry->root.string,
1401 entry->u.def.section,
1402 entry->u.def.section == bfd_abs_section_ptr
1403 ? info->output_bfd : entry->u.def.section->owner);
1411 einfo (_(" relocation truncated to fit: %s against `%T'"),
1414 einfo ("+%v", addend);
1419 /* This is called when a dangerous relocation is made. */
1422 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1423 const char *message,
1428 einfo (_("%X%H: dangerous relocation: %s\n"),
1429 abfd, section, address, message);
1433 /* This is called when a reloc is being generated attached to a symbol
1434 that is not being output. */
1437 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1443 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1444 abfd, section, address, name);
1448 /* This is called if link_info.notice_all is set, or when a symbol in
1449 link_info.notice_hash is found. Symbols are put in notice_hash
1450 using the -y option, while notice_all is set if the --cref option
1451 has been supplied, or if there are any NOCROSSREFS sections in the
1452 linker script; and if plugins are active, since they need to monitor
1453 all references from non-IR files. */
1456 notice (struct bfd_link_info *info,
1457 struct bfd_link_hash_entry *h,
1458 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1462 flagword flags ATTRIBUTE_UNUSED)
1468 if (command_line.cref || nocrossref_list != NULL)
1469 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1473 name = h->root.string;
1474 if (info->notice_hash != NULL
1475 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1477 if (bfd_is_und_section (section))
1478 einfo ("%B: reference to %s\n", abfd, name);
1480 einfo ("%B: definition of %s\n", abfd, name);
1483 if (command_line.cref || nocrossref_list != NULL)
1484 add_cref (name, abfd, section, value);